nightlight

Nightlight inverts the colors on webpages for better ergonomics working in dark or dimly lit rooms. The result is that instead of the typical dark text on a light background you get light text on a dark background. Images are not inverted so graphics still render nicely on most pages. Background images ARE inverted.
It is simple to toggle on or off with a click of a button.
Works well for most pages but it is only a first pass attempt at solving the problem -- feedback is welcome!